Is there a running Domain Controller present? If so DNS info is often stored in Active Directory (A.D. Inegrated DNS Zone). If this is the case you can just connect a server to the network, join the domian (verify DNS settings in TCI/IP config is pointing to Domain Controller) and then installm DNS from Add/Remove windows components. Zone data should replicate from AD to new DNS server, to verify open DNS console and look for resource records relevent to the domain.
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When your phone connects to the Internet, a DHCP (Dynamic Host Configuration Protocol) server on the Internet supplies an IP-address for your phone, and it also supplies the IP-address of a DNS (Domain Name Service) server.
Connect to the DNS-server to translate a name, e.g., 'www.ibm.com' to an IP-address.
So, if your Internet connection is not working, your phone cannot "talk" to the DNS-server, and your phone reports "unavailable".
So, check your Internet settings, to confirm that you have a connection.
Call the "Support Desk" of your Internet Service Provider, if that "DNS Servers" line is blank -- or even if it is non-blank -- ask the ISP what the values *SHOULD* be -- just in case your computer has been "hijacked" to point to "rogue" DNS-servers.
Your first step in setting up DNS for your domain is create some A records, or host records, that point to servers that you are hosting resources (like a website). So, for example, let's say you are hosting a website on a server with IP 188.8.131.52. You'll create an A record for 'www' (without the quotes) to point to 184.108.40.206. This way, when someone goes to www.buy2sale.co.in, they'll be sent to your web server.
DNS is the primary name resolution service for Windows Server 2003. Active Directory depends on DNS for domain controller location, and DNS influences Active Directory domain naming. Thus, to fully understand Active Directory, it helps to understand how DNS acts as an integral component in the design of Active Directory.
DNS provides Active Directory with both a name resolution service for domain controller location and a hierarchical design that Active Directory leverages to provide a naming convention that can reflect organizational structure.
Typically, a DNS domain namespace deployed to accommodate the Active Directory mirrors the Active Directory domain namespace. In cases where there is an existing DNS namespace prior to Active Directory deployment, the DNS namespace is typically partitioned for Active Directory, and a DNS subdomain and delegation for the Active Directory forest root is created. Additional DNS domain names are then added for each Active Directory child domain.
DNS data is used to support the location of Active Directory domain controllers also. During or after the creation of the DNS zones used to support Active Directory domains, the zones are populated with DNS resource records that enable network hosts and services to locate Active Directory domain controllers.